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Re: [Qemu-devel] [PATCH 5/8] tcg: Add interpreter for bytecode

From: Andi Kleen
Subject: Re: [Qemu-devel] [PATCH 5/8] tcg: Add interpreter for bytecode
Date: Mon, 19 Sep 2011 16:48:42 +0200
User-agent: Mutt/

> You generally want CSE, yes?  So you can't blame gcc for getting it 
> wrong sometimes.

There are cases where CSE pessimizes the code, .e.g when it increases
memory pressure too much or caches something that is easier recomputed.
This is just another one.

BTW I checked again and the problem seems to be fixed in gcc 4.6, still
there in 4.5, at least in my example.


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